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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Lease Payments Under Noncancelable Operating Leases
Future minimum lease payments under non-cancellable operating leases at December 31, 2016, are as follows (in thousands):
 
Operating Leases
Year ending December 31,
 
2017
$
12,971

2018
12,361

2019
10,631

2020
7,407

2021
2,020

Thereafter
7,923

Total minimum payments
$
53,313

Summary of Warranty Accrual Included in Accrued Liabilities
Activities for the Company’s warranty accrual for each fiscal year, which is included in accrued and other current liabilities, is summarized below (in thousands):
 
2016
 
2015
 
2014
Balance at beginning of period
$
3,913

 
$
4,242

 
$
3,606

   Accrual for current period warranties
5,655

 
5,470

 
7,278

   Balance assumed from TVN acquisition
1,012

 

 

   Changes in liability related to pre-existing warranties
(173
)
 
(92
)
 
3

   Warranty costs incurred
(5,545
)
 
(5,707
)
 
(6,645
)
Balance at end of period
$
4,862

 
$
3,913

 
$
4,242